Heart in one's mouth:
心在某人的嘴巴里 ×
非常紧张;提心吊胆;害怕之极 √
例句:
When the bear came out of the woods towards us, our hearts were in our mouths.
当熊从树丛中朝我们走来时,我们的心都快跳出来了。
Put words into one's mouth:
将话塞进某人的嘴巴里 ×
无根据地说某人说过某些话 √
例句:
Stop putting words into my mouth!
不要再无根据地说我的瞎话了!
Run off at the mouth:
从嘴巴流出来 ×
信口开河
例句:
Don't trust him. He always runs off at the mouth.
不要相信他,他经常信口开河。